Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2000CAB & CHASSIS K2500, 7.4 J, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 484 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 6.0L BI-FUEL & CNG)DIAGNOSTIC TESTSDTC P0611: FUEL INJECTOR CONTROL MODULE PERFORMANCEDIAGNOSTIC PROCEDURE
2000 Chevrolet Cab & Chassis K2500, 7.4 J, Automatic
Diagnostic Procedure
2000 Chevrolet Cab & Chassis K2500, 7.4 J, AutomaticSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the Diagnostic System Check - Alternative Fuels - Engine Controls. If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ALTERNATIVE FUELS - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition on, with engine OFF. Using a scan tool, clear the DTC information. Attempt to start and idle the engine. Using a scan tool, observe the DTC information. If DTC P0611 resets, go to next step. If DTC P0611 does not reset. see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition off. Disconnect the FICM harness connector. Turn ignition on, with engine off. Probe the FICM ignition feed circuit with a test light connected to a good ground. If the test light illuminates, go to next step. If the test light does not illuminate, go to step 5.
- Probe the FICM ground circuits with a test light connected to battery positive. If the test light illuminates for both ground circuits, go to step 7. If the test light does not illuminate for both ground circuits, go to step 6.
- Repair the open or short to ground on the FICM ignition feed circuit. After repairs are complete, go to step 9.
- Repair the open on the FICM ground circuit. After repairs are complete, go to step 9.
- Test for an intermittent and/or a poor connection at the control module. Did you find and an intermittent and/or poor connection? If yes, go to step 9. If no, go to next step.
- Replace the FICM. After replacement is complete, go to next step.
- Turn the ignition off for 30 seconds. Turn ignition on, with engine off. If the DTC failed this ignition cycle, go to step 2. If the DTC did not fail this ignition cycle, go to next step.
- Observe the Capture Info using a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.